煤炭工程 ›› 2025, Vol. 57 ›› Issue (3): 35-43.doi: 10. 11799/ ce202503006

• 施工技术 • 上一篇    下一篇

千米深井中厚煤层沿空巷道切顶卸压技术研究

王金强,丁坤朋,王文,等   

  1. 1. 平顶山天安煤业股份有限公司十二矿,河南 平顶山 467000

    2. 河南理工大学 河南理工产业技术研究院,河南 焦作 454000

    2. 河南理工大学 能源科学与工程学院,河南 焦作 454000

    4. 河南明德矿山技术开发有限公司,河南 焦作 454000

  • 收稿日期:2024-05-21 修回日期:2024-08-04 出版日期:2025-03-10 发布日期:2025-05-15
  • 通讯作者: 丁坤朋 E-mail:514270212@qq.com

Roof cutting and pressure relief technology fr gob-side entry in medium-thick coal seam of kilometer-deep mine

  • Received:2024-05-21 Revised:2024-08-04 Online:2025-03-10 Published:2025-05-15
  • Contact: ding kunpeng ding kunpengding kunpeng E-mail:514270212@qq.com

摘要:

针对平煤十二矿千米深井小煤柱沿空巷道矿压显现剧烈的问题, 在研究工作面端部覆岩结构及其力学影响、爆破切顶卸压技术特征的基础上,提出了深浅孔组合爆破方法,并在己15-31040工作面进行现场应用。研究得到:基本顶断裂位置位于煤柱外侧且悬臂长度较小时煤柱及沿空巷道受载荷最小;提出了“深孔(装药)-浅孔(装药)-深孔(不装药)”循环布置的深浅孔组合定向控制爆破方法,在深孔和浅孔聚能爆破能量和控制孔导向作用下可实现坚硬顶板定向造缝;结合工作面地质特征和切顶技术要求, 确定切顶参数为切顶高度30.7m、切顶角度15°(偏向采空区)、深孔直径94 mm、浅孔直径55mm、钻孔间距0.8m、深孔孔深32.5m、浅孔孔深15m。现场应用效果表明,采用深浅孔组合定向控制爆破方法成缝率超过90%,巷道围岩矿压及变形均得到有效控制,为类似条件矿井安全高效开采提供借鉴和参考。

关键词: 千米深井 , 切顶卸压 , 沿空巷道 , 定向爆破 , 强矿压

Abstract:

Aiming at the problem of severe mine pressure in the gob-side entry of small coal pillar of Pingdingshan No.12 coal mine, the overburden structure and its mechanical influence at the end of the working face, the principle of roof cutting and pressure relief technology and the combined blasting method of deep and shallow holes are studied. The research shows that the fracture form of the basic roof has a significant effect on the stability of the surrounding rock of the gob-side entry, and the load of the coal pillar and the gob-side entry is the smallest when the cantilever length is small and the fracture position of the basic roof need to located outside the coal pillar. In order to solve the technical problem of hard roof blasting in 1 000 m deep mine, a deep-shallow hole combined directional control blasting method with “deep hole (explosives)-shallow hole (explosives)-deep hole (no explosives)” cyclic arrangement is proposed, and the directional fracture of hard roof is realized under the action of deep-shallow holes shaped blasting energy and control holes guidance. Combined with the geological characteristics of the working face, it is determined that the target height of roof cutting is 30.7m, the angle of roof cutting is 15° to the side of goaf, the diameter of deep hole is 94mm, the diameter of shallow hole is 55mm, the spacing of borehole is 0.8m, the position of borehole opening is 0.6m from the side of roadway, the depth of deep hole is 32.5m, and the depth of shallow hole is 15m. The practice shows that the combination of deep and shallow hole directional control blasting method has good seaming effect, and can effectively control the stress of gob-side roadway, which provides reference for safe and efficient mining in mines with similar conditions.

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